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Romashka-Z-Leto [24]
3 years ago
10

Which change in the state of matter is thermal energy released ​

Chemistry
2 answers:
Svet_ta [14]3 years ago
7 0

the state of matter where thermal energy is released is gas..

ycow [4]3 years ago
3 0

Answer:

Condensation

Explanation:

Thermal energy is released in this process

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What are the four important steps needed to obtain accurate melting points on a mel-temp
AveGali [126]

Explanation:

1) refine the specimen into fine powder 2) place the smallest amount you can see in the capillary tube 3) set the voltage to increase exponentially to 200 below the predicted temperature, then adjust so that the temperature rises to 20 per minute 4) report the temperature at which the liquid first appears and the temperature at which the last crystal disappears.

3 0
3 years ago
Identify the single displacement reaction.
pishuonlain [190]

Answer : The correct option is, (D)

Explanation :

Option A reaction : C_4H_{12}+7O_2\rightarrow 6H_2O+4CO_2

It is a combustion reaction. A reaction in which a hydrocarbon react with the oxygen to give product as carbon dioxide and water.

Option B reaction : 2H_2+O_2\rightarrow 2H_2O

It is a combination reaction. A reaction in which the two or more reactants react to give a product.

Option C reaction : Al_2S_3\rightarrow 2Al+3S

It is a decomposition reaction. A reaction in which a reactant decomposes to form two or more products.

Option D reaction : Cl_2+2KBr\rightarrow 2KCl+Br_2

It is a single displacement reaction. It is a reaction in which the more reactive element displace the less reactive element.  In this reaction, most reactive element chlorine displaces the less reactive element bromine.

Hence, the correct option is, (D)

3 0
3 years ago
Read 2 more answers
Are pure substances chemically combined​
dmitriy555 [2]

Pure substances can or can not be chemically combined.

Pure substances can be either elements or compounds, but not mixture. Mixture are different substances mixing together without being chemically combined, such as air, which is a mixture of oxygen, carbon dioxide, water etc. Mixture can be separated by physical methods, like filtration or decantation.

Meanwhile, elements are the substances that cannot be further separated by any means. No matter physical or chemical methods. Examples of elements are oxygen, hydrogen, neon and all the other ones from the periodic table. Compounds are basically elements joining together, but they’re chemically combined which means their electrons (kind of subatomic particle) are either shared or given away. These elements can only be separated by chemical methods like electrolysis or heating.

Therefore, as long as the substance cannot be separated by physical methods, it can be considered as a pure substance. We can now conclude that pure substance can be (element) or can not be (compound) chemically combined.

4 0
3 years ago
How much work is done if an object moves 4.5 m in has 12 Newtons of force on it
Cloud [144]

The formula of work is Work (Joules)=Force (Newtons) · distance in the direction of the force (meters), therefore its just a matter of replacing factors.

Work done = 12 · 4.5= 54 joules

4 0
3 years ago
Student Exploration: Limiting Reactants Vocabulary: chemical equation, chemical formula, chemical reaction, coefficient, limitin
SIZIF [17.4K]

Answer:

30 hot dogs

Explanation:

It is given that :

There are 4 packets of eight wieners, i.e. 4 x 8 = 32 wieners

There are 3 bags of ten buns, i.e. 3 x 10 = 30 buns

One hot dogs need 1 bun and 1 wiener to make a hot dog.

There are 30 buns, so 30 hot dogs can be made out by using all the 30 buns and the 30 wieners out of the 32 wieners.

Therefore, 30 hot dogs.

And the number of extra wieners left = 32 - 30 = 2 wieners.

6 0
2 years ago
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